Thread: Inner Join - Explicit vs Implicit Join Performance

Inner Join - Explicit vs Implicit Join Performance

From

"Gnanakumar"

Date:

19 October 2011, 10:47:28

Hi,

In PostgreSQL, is there any performance difference between queries written
using "explicit join notation" vs "implicit join notation" in complex
queries?

EXAMPLE: Simple "explicit join notation"
SELECT *
FROM   employee INNER JOIN department
ON     employee.DepartmentID = department.DepartmentID;

EXAMPLE: Simple "implicit join notation"
SELECT *
FROM   employee, department
WHERE  employee.DepartmentID = department.DepartmentID;

Regards,
Gnanam

Re: Inner Join - Explicit vs Implicit Join Performance

From

Pavel Stehule

Date:

19 October 2011, 11:15:11

Hello

no, there is no difference - you can check it via EXPLAIN statement

Regards

Pavel Stehule

2011/10/19 Gnanakumar <gnanam@zoniac.com>:
> Hi,
>
> In PostgreSQL, is there any performance difference between queries written
> using "explicit join notation" vs "implicit join notation" in complex
> queries?
>
> EXAMPLE: Simple "explicit join notation"
> SELECT *
> FROM   employee INNER JOIN department
> ON     employee.DepartmentID = department.DepartmentID;
>
> EXAMPLE: Simple "implicit join notation"
> SELECT *
> FROM   employee, department
> WHERE  employee.DepartmentID = department.DepartmentID;
>
> Regards,
> Gnanam
>
>
>
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